3Sedimentary rocks are the only type of rocks that contain fossils But thatХs not the only reason sedimentary rocks are important. Scientists study the rocks to learn about EarthХs history, while other people collect the rocks for use in construction, farming, and even art. This title introduces readers to these useful rocks, including information about how to identify them, how they form, and how people use them. Special features, including a profile, an activity, and formation diagrams, help highlight the key features of sedimentary rocks in this title for curious readers.